[lubuntu] Headphones not working in Gazelle Professional /Ubuntu 13.04

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http://ubuntuforums.org – I have a brand new Gazelle Professional (gazp9) running Ubuntu 13.04. When my 3 mm headphones are plugged in there is no sound. I have tried making sure that alsamixer settings allow sound to the headphones (like disabling auto-mute and ensurring that the audio volume is not zero). Nothing seems to work. And, yes, the headphones are plugged into the right jack, and otherwise work in my Windows machine. Has anyone encountered this issue or know what I should do? (Hardware)